According to IDC, factory revenue in the worldwide server market declined 1.

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9% year over year to $11.9 billion in the first quarter of 2006. Following ten successive quarters of year-over-year revenue growth, this was the second consecutive quarter of year-over-year revenue decline as quarterly compares become more difficult. Worldwide server unit shipments growth slowed modestly to 9.5% in 1Q06 when compared with 1Q05.

Microsoft Windows servers continued to show strong growth as revenues grew 5.9% and unit shipments grew 12.9% year over year. Significantly, quarterly factory revenue of $4.4 billion for Windows servers represented the largest single segment of the server market, comprising 37.1% of all server revenue in 1Q06.
Unix servers experienced a 7.1% decline in factory revenue year over year, while unit shipments declined 8.7% when compared with 1Q05. Worldwide Unix revenues of more than $3.9 billion for the quarter and represented 33.2% of overall quarterly factory revenue.

Linux servers posted their fifteenth consecutive quarter of double-digit growth, with year-over-year revenue growth of 17.0% and unit shipments up 14.4%. Linux servers now represent 12.2% of all server revenue.

Although the x86 server market continued to grow in 1Q06 with revenue of $6.1 billion worldwide, year-over-ear growth slowed to 6.3% in 1Q06 from 12.7% in 1Q05. Unit shipment growth also continued with a moderate gain of 12.1% to 1.7 million servers.